TD-LTE-A上行链路中检测技术的研究与实现
发布时间：2019-05-27 12:16
【摘要】：科技和社会的不断进步推动了移动通信技术持续演进,更高速更便捷的移动通信的需求催生了LTE及其演进技术。单载波频分多址(SC-FDMA)作为LTE中上行的传输方案,一方面可以利用OFDM子载波之间的正交性,提高频谱利用率;同时由于单载波特性可以降低信号的峰均功率比。在LTE系统中如何克服无线信道的影响,消除多径效应和多普勒频移等带来的各种干扰和信号损失非常重要,如何在接收端高效且准确地恢复发送信号,保证信号的可靠传输成为LTE研究重点。基于此,本文对TD-LTE-A上行链路中的信号检测技术进行了研究与分析。首先,本文对TD-LTE-A上行链路中的关键技术进行了介绍。主要介绍了上行链路中的SC-FDMA特性和生成方式,同时介绍了上行MIMO技术,包括单用户SIMO、空分复用和多用户虚拟MIMO等传输方式。此外对LTE中采用的仿真信道模型进行了介绍。其次,本文分别对单用户SIMO系统和MIMO系统中的检测技术进行了深入的研究。对于SIMO系统的检测主要是基于分集合并思想,包括最大比合并(MRC)算法以及干扰抑制合并(IRC)算法,此外本文还研究了基于Turbo译码软信息反馈的Turbo-MRC检测算法。仿真结果表明,利用Turbo译码软信息进行反馈迭代的Turbo-MRC算法相对于传统MRC算法能够获得一定的性能增益。对于MIMO系统的检测,本文介绍了线性检测算法、传统的干扰消除检测算法和基于Turbo译码软信息反馈的软干扰消除检测算法,其中干扰消除包括串行干扰消除和并行干扰消除两种方式。通过搭建的LTE上行链路,采用相应的仿真信道模型,本文对上面介绍的各种检测算法进行了仿真研究。最后,本文选择了MMSE检测算法进行了FPGA设计。首先对MMSE检测算法的硬件实现结构进行了分析,给出定点仿真模型,然后通过ISE和Modelsim对硬件电路进行功能仿真,然后进行板级测试。电路的时钟可以达到123.93MHz,同时仿真波形和抓取的电路实际数据的分析结果证明了电路设计的正确性,硬件实现结果满足设计需求。
[Abstract]:The continuous progress of science and technology and society has promoted the continuous evolution of mobile communication technology, and the demand for faster and more convenient mobile communication has given birth to LTE and its evolution technology. As the uplink transmission scheme in LTE, single carrier frequency division multiple access (SC-FDMA) can make use of the orthogonality between OFDM subcarriers to improve the spectrum efficiency, and at the same time, the peak-to-average power ratio of the signal can be reduced due to the characteristics of single carrier. How to overcome the influence of wireless channel and eliminate all kinds of interference and signal loss caused by multi-path effect and Doppler shift in LTE system is very important. How to recover the transmitted signal efficiently and accurately at the receiver. To ensure the reliable transmission of the signal has become the focus of LTE research. Based on this, the signal detection technology in TD-LTE-A uplink is studied and analyzed in this paper. First of all, this paper introduces the key technologies in TD-LTE-A uplink. This paper mainly introduces the characteristics and generation methods of SC-FDMA in uplink, and introduces the uplink MIMO technology, including single-user SIMO, space division reuse and multi-user virtual MIMO. In addition, the simulation channel model used in LTE is introduced. Secondly, the detection technology in single-user SIMO system and MIMO system is deeply studied in this paper. The detection of SIMO system is mainly based on the idea of diversity merging, including maximum ratio merge (MRC) algorithm and interference suppression merge (IRC) algorithm. In addition, this paper also studies the Turbo-MRC detection algorithm based on Turbo decoding soft information feedback. The simulation results show that the Turbo-MRC algorithm using Turbo decoding soft information for feedback iteration can obtain a certain performance gain compared with the traditional MRC algorithm. For the detection of MIMO system, this paper introduces the linear detection algorithm, the traditional interference cancellation detection algorithm and the soft interference cancellation detection algorithm based on Turbo decoding soft information feedback. Interference cancellation includes serial interference cancellation and parallel interference cancellation. Through the LTE uplink and the corresponding simulation channel model, various detection algorithms introduced above are simulated and studied in this paper. Finally, the MMSE detection algorithm is selected for FPGA design. Firstly, the hardware implementation structure of MMSE detection algorithm is analyzed, and the fixed-point simulation model is given. Then the hardware circuit is simulated by ISE and Modelsim, and then the board level test is carried out. The clock of the circuit can reach 123.93MHz. At the same time, the analysis results of the simulation waveform and the actual data of the captured circuit prove the correctness of the circuit design, and the hardware implementation results meet the design requirements.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
本文编号：2486136
[Abstract]:The continuous progress of science and technology and society has promoted the continuous evolution of mobile communication technology, and the demand for faster and more convenient mobile communication has given birth to LTE and its evolution technology. As the uplink transmission scheme in LTE, single carrier frequency division multiple access (SC-FDMA) can make use of the orthogonality between OFDM subcarriers to improve the spectrum efficiency, and at the same time, the peak-to-average power ratio of the signal can be reduced due to the characteristics of single carrier. How to overcome the influence of wireless channel and eliminate all kinds of interference and signal loss caused by multi-path effect and Doppler shift in LTE system is very important. How to recover the transmitted signal efficiently and accurately at the receiver. To ensure the reliable transmission of the signal has become the focus of LTE research. Based on this, the signal detection technology in TD-LTE-A uplink is studied and analyzed in this paper. First of all, this paper introduces the key technologies in TD-LTE-A uplink. This paper mainly introduces the characteristics and generation methods of SC-FDMA in uplink, and introduces the uplink MIMO technology, including single-user SIMO, space division reuse and multi-user virtual MIMO. In addition, the simulation channel model used in LTE is introduced. Secondly, the detection technology in single-user SIMO system and MIMO system is deeply studied in this paper. The detection of SIMO system is mainly based on the idea of diversity merging, including maximum ratio merge (MRC) algorithm and interference suppression merge (IRC) algorithm. In addition, this paper also studies the Turbo-MRC detection algorithm based on Turbo decoding soft information feedback. The simulation results show that the Turbo-MRC algorithm using Turbo decoding soft information for feedback iteration can obtain a certain performance gain compared with the traditional MRC algorithm. For the detection of MIMO system, this paper introduces the linear detection algorithm, the traditional interference cancellation detection algorithm and the soft interference cancellation detection algorithm based on Turbo decoding soft information feedback. Interference cancellation includes serial interference cancellation and parallel interference cancellation. Through the LTE uplink and the corresponding simulation channel model, various detection algorithms introduced above are simulated and studied in this paper. Finally, the MMSE detection algorithm is selected for FPGA design. Firstly, the hardware implementation structure of MMSE detection algorithm is analyzed, and the fixed-point simulation model is given. Then the hardware circuit is simulated by ISE and Modelsim, and then the board level test is carried out. The clock of the circuit can reach 123.93MHz. At the same time, the analysis results of the simulation waveform and the actual data of the captured circuit prove the correctness of the circuit design, and the hardware implementation results meet the design requirements.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN929.5
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，本文编号：2486136
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